p raised to power 4-(p+q) raised to power 4.
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p⁴-(p+q)⁴
let (p+q) be r
therefore
p⁴-r⁴
(p-r)(p+r)(p²+r²)
{p-(p+q)}{p+(p+q)}{p²+(p+q)²}
(p-p+q)(p+p+q)(p²+p²+2pq+q²)
(q)(2p+q)(2p²+2pq+q²)
let (p+q) be r
therefore
p⁴-r⁴
(p-r)(p+r)(p²+r²)
{p-(p+q)}{p+(p+q)}{p²+(p+q)²}
(p-p+q)(p+p+q)(p²+p²+2pq+q²)
(q)(2p+q)(2p²+2pq+q²)
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